I am interested in learning more about Klein's paradox. My QM book said you need QFT to treat it properly. I did a quick internet search but found no expository materials. Even Wikipedia had no mention. This forum had very little of substance that I could find on the subject.
Maybe someone can...
Thanks James - I really appreciate your effort. I will read through your answer carefully. I posted a similar question under linear algebra but didn't get a serious
answer.
What prompted this was the fact that
1 0 0 1
0 1 -1 0
work like complex numbers so I wondered what the whole...
NateTG,
0 is just
0 0
0 0
and + is just matrix addition and x is just matrix multiplication.
I found some stupid wikipedia thing where these 4 were given names like
K0 K1 K2 K3 but no references were given so that was a dead end.
I'm at work so I can't look it up in my books.
Thanks, NateTG, for taking the time to respond. That is what I thought until I realized that it had to be a RING for closure. So then I thought I would like to know the NAME of it, at least.
This set of four matrices:
1 0 | 0 1 | -1 0 | 0 1
0 1 | 1 0 | 0 1 | -1 0
are closed under multiplication. What is it called? I know that it is not
those silly quaternions
When people discuss the Lorentz transformation, the start talking about "groups " of transformations SL(2,C), SO(1,3) etc.
Looks impressive! Where can I learn this stuff too?
I asked a similar question in the Linear Algebra section but it gets less traffic
Hi
I am new to solid state. I just read about fermi gas in a cube. For some reason the author used periodic boundary conditions? Why didn't they choose finite well potential where the height of the well is related to the work function?
The average answer seems to be "tunneling diode" but it is difficult to see how one could demonstrate tunneling with such a device - other than to point at it and say "there's tunnelin' in that thar device!" ;)
Thank you very much for both of your replies.
I have seen the "photon tunneling on your kitchen table". Someone else is doing that.
Yes, we have access to a semiconductor fabrication lab! Just tell me what you have in mind and I can get it rolling!
Hi Y'all,
I would like to demonstrate electron tunneling in my Modern Physics lab class.
Does anyone know of how to set such an experiment up?
We have a lot of equipment and $$$ available, so that's not a problem.
I don't want to ask the prof beforehand because he's kinda dumb.
Well I am just learning this stuff and it's pretty clear that there is a lot of obfuscation going on. So I am taking very small bites.
I can definitely visualize a linear transformation. Maps a vector to another vector. Period.
Hmm. I take it you've never read David Hume.
Anyways, I thought a little about this on my lunch break. I came up with "a
linear combination of linear combinations". Doesn't seem like a concept worth worrying about.
Hello Gals,
I know what a scalar is.
I know what a vector is.
I know what a linear transformation is.
But what in the name of sweet aunt petunia is a rank 3 tensor?
Love,
Plx Mny
I didn't know that! Thanks, ZZ. I really didn't think I would get a serious answer in the General Discussion forum.
You singled out PRL. But what about PR(A-Z)?
Please don't take offense, but I respectfully disagree. Gaining publication in a scholarly journal is very important to a physicist, and if one is rejected by Physical Review, what is the next best choice?
I know that there are some journals that will publish crack-pottery, and others that...
Gentlemen,
What is the appropriate forum for the following question:
"Assuming that Physical Review is the #1 journal to get published in,
what would the top 10 be?
Love,
Plxmny"
I think that you are correct. I also heard that landau lifschitz nrqm has an exposition of the technique. i am trying to get a copy now to check.
Also I just learned that the cited reference was re-published in 2000 so I might have some luck there. I will let you all know.
kisses,
plxmny
Thank you - I checked the local university library but they don't have back to 1967 without jumping through hoops. I'll try another tomorrow.
In the meantime I hope someone can shed some light on this imaginary action technique for me.
I tried posting the same query to crackpot-land (google)...
Friends,
I am reading that the standard way to discuss tunneling is via imaginary action.
The reference cited is J.S. Langer, Ann. Phys. 1967.
(1) What is the full name of Ann. Phys. so I can look up this paper?
(2) What textbook can I acquire to learn this technique?
I hope this is what you meant - I was led to tunneling magnetoresistance. But the little description I read said only that spin was assumed conserved during tunneling.
What if the receiving ferromagnet was not present, and the electrons just went into some detector. Would the spin up electrons...
Well, you know that I am interested in how tunneling electrons behave in a magnetic field. At first I thought the Lorentz force would be a good effect to look at, but then I learned a little more and I thought maybe the effect of the magnetic field on spin would be better to study.
No, I do...